[Snyk] Security upgrade golang from 1.18-alpine to 1.19-alpine

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• dockerfile

We recommend upgrading to golang:1.19-alpine, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	400	NULL Pointer Dereference SNYK-ALPINE317-OPENSSL-3314647	No Known Exploit
	400	Use After Free SNYK-ALPINE317-OPENSSL-3314650	No Known Exploit
	400	Access of Resource Using Incompatible Type ('Type Confusion') SNYK-ALPINE317-OPENSSL-3314651	No Known Exploit
	400	Double Free SNYK-ALPINE317-OPENSSL-3314657	No Known Exploit
	400	NULL Pointer Dereference SNYK-ALPINE317-OPENSSL-3314658	No Known Exploit

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